Index: /issm/trunk/src/m/model/outflow.m
===================================================================
--- /issm/trunk/src/m/model/outflow.m	(revision 6959)
+++ /issm/trunk/src/m/model/outflow.m	(revision 6959)
@@ -0,0 +1,14 @@
+function flag=outflo(md);
+
+A=md.segments(:,1);
+B=md.segments(:,2);
+Nx=-(md.y(A)-md.y(B));
+Ny=  md.x(A)-md.x(B);
+Vx=(md.vx(A)+md.vy(B))/2;
+Vy=(md.vy(A)+md.vy(B))/2;
+
+%dot product
+VdotN=Vx.*Nx+Vy.*Ny;
+
+flag=zeros(md.numberofgrids,1);
+flag(A(find(VdotN>0)))=1;